Sample collecting and introducing device and detection system

ABSTRACT

The present disclosure relates to the technical field of safety detection, and in particular to a sample collecting and introducing device and a detection system. The sample collecting and introducing device provided by the present disclosure includes a sampling device for collecting a sample, and a semipermeable membrane device for extracting the sample collected by the sampling device and conveying the extracted sample to detection equipment, wherein the sampling device is provided with an air guide cavity, the air guide cavity is configured to guide airflow carrying the sample to flow to the semipermeable membrane device, the semipermeable membrane device is provided with a semipermeable membrane which is arranged outside the sampling device. In the present disclosure, the size of the semipermeable membrane is no longer limited by the sampling device, and therefore the difficulty of increasing the area of the semipermeable membrane is reduced.

CROSS-REFERENCES TO RELATED APPLICATIONS

The present application claims the priority of Chinese Application No.201711429544.X, filed in the Chinese Patent Office on Dec. 26, 2017,whose entire contents are herein incorporated by reference.

FIELD

The present disclosure relates to the technical field of safetydetection, and in particular to a sample collecting and introducingdevice and a detection system.

BACKGROUND

In order to improve the safety, detection equipment is applied to detecttrace substances attached to a detected object, and in order tocooperate with the detection, a sample collecting and introducing deviceis applied to collect and extract samples attached to the detectedobject.

At present, there are a variety of sample collecting and introducingdevices. As one of them, the sample collecting and introducing devicecomprises a sampling device and a semipermeable membrane device, whereinthe sampling device sweeps the detected object via airflow to collectsamples and conveys the collected samples to the semipermeable membranedevice through an air guide cavity, and the semipermeable membranedevice extracts the samples via a semipermeable membrane and conveys theextracted samples to the detection equipment for detection. As thesamples are extracted by the semipermeable membrane, not only theinstrument contamination can be prevented, but also an enrichmentfunction can be played on the samples to improve the samplingefficiency. The larger the area of the semipermeable membrane is, themore favorable to improve the sampling efficiency it is.

However, in the prior art, the semipermeable membrane is usuallyarranged inside the sampling device. In this case, to increase the areaof the semipermeable membrane, the size of a structural component of thesampling device outside of the semipermeable membrane has to beincreased accordingly, which is difficult, and increases the weight andthe volume of the entire sample collecting and introducing device, thusmaking the sample collecting and introducing device inconvenient to use.

SUMMARY

One technical problem to be solved by the present disclosure is toreduce the difficulty of increasing the area of a semipermeable membraneof a sample collecting and introducing device.

In order to solve the above technical problem, on one side the presentdisclosure provides a sample collecting and introducing device,comprising:

a sampling device, for collecting a sample; and

a semipermeable membrane device, for extracting the sample collected bythe sampling device and introducing the extracted sample to detectionequipment;

wherein the sampling device is provided with an air guide cavity whichis configured to guide airflow carrying the sample to flow to thesemipermeable membrane device, the semipermeable membrane device isprovided with a semipermeable membrane, and the semipermeable membraneis arranged at the outside of the sampling device.

According to some embodiments of the disclosure, the semipermeablemembrane device further comprises a holding member for holding thesemipermeable membrane, and a first space located at one side of thesemipermeable membrane and a second space located at the other side ofthe semipermeable membrane exist between the holding member and thesemipermeable membrane, wherein the air guide cavity guides the airflowcarrying the sample to flow into the first space, the sample carried bythe airflow flowing into the first space enters the second space afterbeing desorbed by the semipermeable membrane, and the second space is influid communication with the detection equipment.

According to some embodiments of the disclosure, at least one of aconcave part and a convex part is provided on a side surface of theholding member adjacent to the semipermeable membrane.

According to some embodiments of the disclosure, the semipermeablemembrane device further comprises an air pump, the air pump is in fluidcommunication with the first space to discharge the airflow that doesnot penetrates through the semipermeable membrane to the outside of thefirst space.

According to some embodiments of the disclosure, the semipermeablemembrane device further comprises a gas supply device, the gas supplydevice is in fluid communication with the second space to inject acarrier gas into the second space, and the carrier gas flows to thedetection equipment after being mixed with the sample that is desorbedby the semipermeable membrane and enters the second space.

According to some embodiments of the disclosure, the semipermeablemembrane device further comprises a filtering device, the filteringdevice is arranged on a communication passage between the gas supplydevice and the second space to filter the carrier gas flowing from thegas supply device to the second space.

According to some embodiments of the disclosure, the semipermeablemembrane device further comprises a temperature control device, thetemperature control device is configured to heat and cool thesemipermeable membrane, so that the semipermeable membrane deviceenriches the sample at a relatively low temperature and desorbs thesample at a relatively high temperature.

According to some embodiments of the disclosure, the semipermeablemembrane device enriches (or extracts) the sample at a relatively lowtemperature and desorbs the sample at a relatively high temperature.

According to some embodiments of the disclosure, the sample collectingand introducing device further comprises a sample introducing tube, andthe sample introducing tube is connected between the air guide cavityand the semipermeable membrane device.

According to some embodiments of the disclosure, the semipermeablemembrane device is arranged at the outside of the sampling device.

According to some embodiments of the disclosure, the sampling devicecomprises an ejection part, the ejection part is configured to sweep thesample attached to the detected object through the airflow, and theswept sample flows to the air guide cavity under the drive of theairflow.

According to some embodiments of the disclosure, the ejection partcomprises an air pump, an air ejection cavity and an ejection hole,which are in fluid communication with each other successively, and theair pumped by the air pump is ejected toward the detected object throughthe air ejection cavity and the ejection hole.

According to some embodiments of the disclosure, the sampling devicefurther comprises a cyclone generation part, and the cyclone generationpart is configured to generate cyclone and drive the sample swept by theejection part to flow to the air guide cavity via the generated cyclone.

According to some embodiments of the disclosure, the cyclone generationpart comprises an air supplementing pump, an air supplementing cavityand a swirling hole, which are in fluid communication with each othersuccessively, the air supplementing pump pumps airflow into the airsupplementing cavity, and the swirling hole rotationally ejects theairflow entering the air supplementing cavity to form the cyclone.

According to some embodiments of the disclosure, the swirling holeextends from the air supplementing cavity to the outer surface of thesampling device.

Another aspect of the present disclosure further provides a detectionsystem, including detection equipment and the sample collecting andintroducing device of the present disclosure, and the semipermeablemembrane device of the sample collecting and introducing device is influid communication with the detection equipment.

According to the sample collecting and introducing device provided bythe disclosure, the semipermeable membrane is arranged at the outside ofthe sampling device, so that the size of the semipermeable membrane isno longer limited by the sampling device, and therefore, it becomes lessdifficult to increase the area of the semipermeable membrane.

Other embodiments of the present disclosure and the advantages thereofwill become apparent from the following detailed description of theexemplary embodiments of the present disclosure with reference to thedrawings.

BRIEF DESCRIPTION OF THE DRAWINGS

To illustrate technical solutions in the embodiments of the presentdisclosure or in the prior art more clearly, a brief introduction on thedrawings which are needed in the description of the embodiments or theprior art is given below. Apparently, the drawings in the descriptionbelow are merely some of the embodiments of the present disclosure,based on which other drawings can be obtained by those of ordinary skillin the art without any creative effort.

FIG. 1 shows a longitudinal section schematic diagram of a samplecollecting and introducing device in an embodiment of the presentdisclosure.

FIG. 2 shows a schematic diagram of a state in which the samplecollecting and introducing device as shown in FIG. 1 collects a samplefrom a detected object.

FIG. 3 shows a top view of the sample collecting and introducing deviceas shown in FIG. 1.

FIG. 4 shows a structural schematic diagram of a holding member.

DETAILED DESCRIPTION OF THE INVENTION

A clear and complete description of technical solutions in theembodiments of the present disclosure will be given below, incombination with the drawings in the embodiments of the presentdisclosure. Apparently, the embodiments described below are merely apart, but not all, of the embodiments of the present disclosure. Thefollowing description of at least one exemplary embodiment is merelyillustrative, and is in no way to serve as any limitation to the presentdisclosure or the application or use thereof. All of other embodiments,obtained by those of ordinary skill in the art based on the embodimentsof the present disclosure without any creative effort, fall into theprotection scope of the present disclosure.

Techniques, methods and equipment known to those of ordinary skill inthe relevant art may not be discussed in detail, but where appropriate,the techniques, methods and equipment should be considered as a part ofthe specification as granted.

In the description of the present disclosure, it should be understoodthat orientations or positional relationships indicated by orientationwords such as “front, back, upper, lower, left, right”, “lateral,vertical, perpendicular, horizontal” and “top, bottom” and the like aregenerally based on the orientations or positional relationships shown inthe drawings, and are merely for the convenience describing the presentdisclosure and simplifying the description, the above orientation wordsare not intended to indicate or imply that the devices or elementsreferred to must have particular orientations or be constructed andoperated in particular orientations, if not otherwise stated, and thuscannot be construed as limitations to the protection scope of thepresent disclosure; and the orientation words “inside and outside” referto the inside and the outside of the contours of the componentsthemselves.

In the description of the present disclosure, it should be understoodthat parts and components are defined by such words as “first”, “second”and the like merely for the purpose of facilitating the distinction ofthe corresponding parts and components, and if not otherwise stated, theabove words have no particular meaning, and thus cannot be construed aslimitations to the protection scope of the present disclosure.

FIGS. 1 to 4 illustrate an embodiment of the sample collecting andintroducing device of the present disclosure. With reference to FIG. 1to FIG. 4, the sample collecting and introducing device provided by thepresent disclosure comprises a sampling device 1 for collecting asample, and a semipermeable membrane device 3 for extracting the samplecollected by the sampling device 1 and introducing the extracted sampleto detection equipment 4, wherein the sampling device 1 is provided withan air guide cavity 1 j, which is configured to guide airflow carryingthe sample to flow to the semipermeable membrane device 3, thesemipermeable membrane device 3 is provided with a semipermeablemembrane 34, and the semipermeable membrane 34 is arranged at theoutside of the sampling device 1.

In the present disclosure, the semipermeable membrane 34 of the samplecollecting and introducing device is arranged at the outside of thesampling device 1, so that the size of the semipermeable membrane 34 isno longer limited by the sampling device 1, and thus the difficulty ofincreasing the area of the semipermeable membrane 34 can be reduced,which is favorable to improve the sampling efficiency and the userexperience.

The present disclosure is further described below with reference to theembodiment as shown in FIGS. 1 to 4.

As shown in FIGS. 1 to 4, in the embodiment, the sample collecting andintroducing device comprises a sampling device 1, a sample introducingtube 2 and a semipermeable membrane device 3. The sampling device 1 isconfigured to collect the sample attached to a detected object 6 bysweeping the detected object 6 with airflow and convey the collectedsample to the semipermeable membrane device 3; the semipermeablemembrane device 3 is configured to extract the sample collected by thesampling device 1 and convey the sample to the detection equipment 4 fordetection. In the embodiment, the semipermeable membrane device 3 isarranged at the outside of the sampling device 1 and is connected withthe sampling device 1 through the sample introducing tube 2. The sampleattached to the detected object 6 may be a volatile substance, asemi-volatile substance and a surface contaminant in the detected object6 and may be a trace substance in various forms such as granule orpowder.

As shown in FIG. 1, the sampling device 1 of the embodiment comprises anejection part and a flow guide part, the ejection part is configured tosweep off the sample attached to the detected object 6 through theairflow; and the flow guide part communicates with the semipermeablemembrane device 3 to introduce the sample swept by the ejection part toflow to the semipermeable membrane device 3.

It can be seen in combination with FIG. 1 and FIG. 2, in the embodiment,the ejection part comprises an air pump 10, an air ejection cavity 1 fand an ejection hole 1 h, which are in fluid communication with eachother successively, wherein the air pump 10 pumps the air to ejectedtoward the detected object 6 through the air ejection cavity 1 f and theejection hole 1 h. The flow guide part comprises an air guide cavity 1j, and the air guide cavity 1 j is in fluid communication with theejection part and the semipermeable membrane device 3. Based on this,the ejection hole 1 h injects the airflow onto the detected object 6,the airflow can impact and sweep the samples attached to the detectedobject 6, so that the samples are swept off from the detected object 6and are carried by the airflow to flow to the semipermeable membranedevice 3 through the air guide cavity 1 j, thereby realizing thecollection of the samples. Realizing sample collection by means of airsweeping is clean, pollution-free, and conducive to shortening thesample diffusion time and improving the collection efficiency.

Furthermore, in order to improve the collection efficiency of sampleswith a high boiling point, as shown in FIG. 1, in the embodiment, theejection part further comprises a heating device 16 and a heatpreservation device 15. The heating device 16 is configured to heat theair in the air ejection cavity 1 f, so that the ejection part can sweepthe samples on the detected object 6 via hot airflow, which can makesamples with high boiling point be more conveniently driven to deviatefrom the detected object 6, thus the collection of the samples with highboiling point is realized, the risk of leak collection and leakdetection of the samples with high boiling point is reduced, the samplecollection range is widened, and the collection efficiency is improved.Moreover, as the hot airflow can promote samples in granular and clusterform to disperse into single molecules, therefor sweeping the sampleswith the hot airflow can make the samples enter the semipermeablemembrane device 3 more fully in the form of the single molecules, whichnot only can reduce the detection limit of the samples with high boilingpoint, but also can improve the enrichment and desorption efficiency ofthe semipermeable membrane device 3 and the detection sensitivity of thedetection encampment 4. The heating device 16 may be implemented invarious structural forms such as a heating sheet, a heating wire or aheating belt. The heat preservation device 15 is configured to performheat preservation on the air in the air ejection cavity 1 f, in thiscase, the ejection part can be conveniently kept at a desiredtemperature, so that the ejection part can continuously eject theairflow with a preset temperature to the detected object 6, whichfurther improves the working reliability of the ejection part.

Further, in order to further improve the collection efficiency, thesampling device 1 of the embodiment further comprises a cyclonegeneration part, and the cyclone generation part is configured togenerate cyclone and drive the sample swept by the ejection part to flowto the air guide cavity 1 j via the generated cyclone. As shown in FIG.1, the cyclone generation part of the embodiment comprises an airsupplementing pump 14, an air supplementing cavity 1 c and a swirlinghole 1 b, which are in fluid communication with each other successively,wherein the air supplementing pump 14 pumps airflow into the airsupplementing cavity 1 c, and the swirling hole 1 b rotationally ejectsthe airflow entering the air supplementing cavity 1 c to form thecyclone. The cyclone generated by the cyclone generation part is similarto a tornado, which can generate a negative pressure center with a largenegative pressure above the air guide cavity 1 j, and the negativepressure center can suck the sample swept by the ejection part, so thatthe sample swept by the ejection part can flow to the semipermeablemembrane device 3 via the flow guide cavity 1 j more efficiently andmore smoothly, thereby improving the sample collection efficiency.

Specifically, as shown in FIG. 1 and FIG. 3, the sampling device 1 ofthe embodiment comprises a shell, and the shell comprises an outercavity body 11, an upper cover 12 and a bottom cover 19. The outercavity body 11 is hollow and opens at both upper end and lower end. Theupper cover 12 covers the upper opening of the outer cavity body 11. Thebottom cover 19 covers the lower opening of the outer cavity body 11.The bottom cover 19 is connected with the outer cavity body 11 by asecond screw 1 e. The shell provides a mounting base for otherstructural components of the sampling device 1 and provides a certainsupporting and protecting function for the other structural componentsof the sampling device 1 located in the shell. The air ejection cavity 1f, the ejection hole 1 h, the air guide cavity 1 j, the heating device16, the heat preservation device 15, the air supplementing cavity 1 cand the swirling hole 1 b are all disposed inside the shell.

It can be seen from FIG. 1 that the sampling device 1 of the embodimentfurther comprises an air ejection cavity body 17 and an air guide cavitybody 18 disposed in the shell, the air ejection cavity 1 f locatesbetween the air ejection cavity body 17 and the shell, and the air guidecavity 1 i locates between the air guide cavity body 18 and the shell.More specifically, as shown in FIG. 1, the air ejection cavity body 17and the air guide cavity body 18 are arranged inside the upper cover 12;the air ejection cavity body 17 and the air guide cavity body 18 areboth provided with hollow cavities therein and both open at a lower end;the air guide cavity body 18 is located in the air ejection cavity body17; the bottom cover 19 that covers the lower opening of the outercavity body 11 also covers the lower opening of the air ejection cavitybody 17 and the air guide cavity body 18; the heating device 16 isarranged on the outer surface of the air ejection cavity body 17; andthe heat preservation device 15 is arranged at the outside of theheating device 16 and is located between the heating device 16 and theinner wall of the upper cover 12. The heat preservation device 15 isconnected with the upper cover 12 via a first screw 1 d. In this case,the air guide cavity body 18 and the bottom cover 19 enclose the airguide cavity 1 j; the heat preservation device 15, the air ejectioncavity body 17, the air guide cavity body 18 and the bottom cover 19enclose the air ejection cavity 1 f; and the air guide cavity 1 j islocated in the air ejection cavity 1 f, in other words, the air guidecavity 1 j is located at the middle of the sampling device 1. Since thesample swept by the ejection part converges toward the middle of the airejection cavity 1 f under the action of the airflow, the air guidecavity 1 j located at the middle of the sampling device 1 can moreconveniently and efficiently guide the airflow carrying the sample toflow to the semipermeable membrane device 3. Of course, the air ejectioncavity 1 f may not be enclosed by the heat preservation device 15, theair ejection cavity body 17, the air guide cavity body 18 and the bottomcover 19, for example, the air ejection cavity 1 f may be directlyenclosed by the air ejection cavity body 17, the air guide cavity body18 and the bottom cover 19.

In addition, as can be seen from FIG. 1, the bottom cover 19 is providedwith an opening at a position corresponding to the air guide cavity 1 j,so as to facilitate fluid communication between the air guide cavity 1 jand the semipermeable membrane device 3. Further, the bottom cover 19 isalso provided with an opening at a position corresponding to the airejection cavity 1 f, so as to facilitate fluid communication between theair ejection cavity 1 f and the air pump 10. In the embodiment, the airpump 10 and the sample introducing tube 2 are both arranged outside theshell and below the bottom cover 19. The air pump 10 is in fluidcommunication with the air ejection cavity 1 f via an air tube. Thesample introducing tube 2 extend downward from the air ejection cavity 1f to communicate with the semipermeable membrane device 3, therebyrealizing fluid communication between the air guide cavity 1 j and thesemipermeable membrane device 3. Connecting the sampling device 1 andthe semipermeable membrane device 3 with the sample introducing tube 2can facilitate the disassembly and assembly of the sampling device 1 andthe semipermeable membrane device 3, and particularly can make themaintenance and replacement of the semipermeable membrane device 3 moreconvenient and quicker.

The ejection hole 1 h is located on the air ejection cavity body 17. Asshown in FIG. 1 and FIG. 3, in the embodiment, a plurality of ejectionholes 1 h are disposed on the top of the air ejection cavity body 17 atintervals along the circumferential direction of the air ejection cavitybody 17. The ejection hole 1 h is in fluid communication with the airejection cavity 1 f and in fluid communication with the externalenvironment above the air guide cavity 1 j, so as to eject the air inthe air ejection cavity 1 f to the detected object 6 above the air guidecavity 1 j to impact the sample attached to the detected object 6. Ascan be seen from FIG. 1, in the embodiment, the ejection hole 1 h islocated at the outer side of the air guide cavity 1 j, and is inclinedtoward the middle of the air ejection cavity 1 f (namely inclined towardthe central axis of the air guide cavity 1 j) along the direction inwhich the airflow flows from the air ejection cavity 1 f to the detectedobject 6 (namely the direction from bottom to top in FIG. 1), in thisway, the swept sample can be driven to converge toward the middle of theair ejection cavity 1 f, which is on one hand convenient for the sampleto flow into the air guide cavity 1 j located at the middle of the airejection cavity 1 f, and on the other hand convenient for the ejectionpart to better cooperate with the cyclone generation part, enabling thesample to be more fully sucked by the cyclone generated by the cyclonegeneration part.

The air supplementing cavity 1 c is formed between the outer cavity body11 and the upper cover 12. As can be seen from FIG. 1, in theembodiment, the lower end of the upper cover 12 extends into the outercavity body 11 and is enclosed with the outer cavity body 11 to form theair supplementing cavity 1 c. An air supplementing tube 13 is arrangedon the outer cavity body 11, one end of the air supplementing tube 13 isin fluid communication with the air supplementing cavity 1 c, and theother end of the air supplementing tube 13 is in communication with theair supplementing pump 14, so that the air supplementing pump 14 is influid communication with the air supplementing cavity 1 c through theair supplementing tube 13, and the air supplementing pump 14 can pumpthe air into the air supplementing cavity 1 c through the airsupplementing tube 13. Of course, the air supplementing tube 13 can beomitted, and the air supplementing cavity 1 c may be in direct fluidcommunication with the air supplementing pump 14 or may communicate withthe air supplementing pump 14 through other communication members.

The swirling hole 1 b is located on the upper cover 12 and outside theejection hole 1 h and the air guide cavity 1 j. So far, as shown in FIG.1, along the direction that from the central axis of the air guidecavity 1 j to the outer side of the air guide cavity 1 j, the air guidecavity 1, the ejection hole 1 h and the swirling hole 1 b aresuccessively arranged. Moreover, as shown in FIG. 1, in the embodiment,a plurality of swirling holes 1 b are arranged on the upper cover 12 atintervals along the circumferential direction of the upper cover 12 b.Each swirling hole 1 b is arranged obliquely, the central axis of theswirling hole 1 b and the central axis of the air supplementing cavity 1c are non-coplanar, and the inclination angles of the respectiveswirling holes 1 b are approximately the same. Based on this, theairflow ejected from the swirling hole 1 b rotates at a certain anglewith x direction, y direction and z direction, thus generating a cyclonewhich further drives the flow of the external airflow to amplify theairflow to form a cyclone similar to a tornado, thereby forming anegative pressure center above the air guide cavity 1 j. In theembodiment, the swirling hole 1 b extends from the air supplementingcavity 1 c to the outer surface of the sampling device 1, in this case,the swirling hole 1 b is in direct fluid communication with the externalenvironment of the sampling device 1, so that the swirling hole 1 b candirectly and rotationally eject the airflow into the externalenvironment of the sampling device 1. Specifically, the swirling hole 1b extends from the air supplementing cavity 1 c to the upper surface ofthe upper cover 12 and is in fluid communication with the externalenvironment above the air guide cavity 1 j, so that the negativepressure center of the cyclone is formed above the air guide cavity 1 j,which enables the sample swept by the ejection part 1 b to be bettersucked into the air guide cavity 1 j by the cyclone.

Moreover, as shown in FIG. 1, in the embodiment, the sampling device 1further comprises a sample suction port, and the sample suction portcommunicates the air guide cavity 1 j with the external environment toguide the airflow carrying the sample flow to the air guide cavity 1 j.It can be seen from FIG. 1 that the sample suction port of theembodiment comprises a first sample suction port 1 g and a second samplesuction port 1 k, wherein, the first sample suction port 1 g is arrangedon the top of the upper cover 12 and communicates the externalenvironment with the second sample suction port 1 k and the ejectionhole 1 h, besides, the first sample suction port 1 g is of a taperedhorn shape from top to bottom; while the second sample suction port 1 kis arranged on the top of the air ejection cavity body 17 andcommunicates the first sample suction port 1 g with the air guide cavity1 j, besides, the second sample suction port 1 k is of a tapered hornshape from top to bottom. The edge of a bottom surface (the surface withthe minimum cross sectional area) of the first sample suction port 1 gis located on the outer side of the ejection hole 1 h; and the edge of atop face (the surface with the maximum cross sectional area) of thesecond sample suction port 1 k is located on the inner side of theejection hole 1 h. Based on the setting, the first sample suction port 1g and the second sample suction port 1 k are successively arranged alongthe direction in which the airflow flows from the detected object 6 tothe air guide cavity 1 j (namely the direction from top to bottom inFIG. 1); furthermore, along the direction in which the airflow flowsfrom the detected object 6 to the air guide cavity 1 j, the crosssectional area of the first sample suction port 1 g and that of thesecond sample suction port 1 k both decrease; and meanwhile, the minimumcross sectional area of the first sample suction port 1 g is greaterthan the maximum cross sectional area of the second sample suction port1 k. In this way, along the direction in which the airflow flows fromthe detected object 6 to the air guide cavity 1 j, the cross sectionalarea of the sample suction port decreases, specifically is in the shapeof a tapered horn. As the radius of the cyclone generated by the cyclonegeneration part of the sampling device 1 in the embodiment decreasesfrom top to bottom, therefore, the sample suction port with reducedcross sectional area from top to bottom is more adapted to thecharacteristics of the cyclone airflow, so as to better guide the sampleto flow to the air guide cavity 1 j under the suction of the cycloneairflow.

In order to improve the airtightness of the sampling device 1, as shownin FIG. 1, the sampling device 1 of the embodiment further comprises aplurality of sealing rings 1 a. Specifically, as can be seen from FIG.1, the sealing rings 1 a are arranged between the outer wall of theupper cover 12 and the inner wall of the outer cavity body 11 to improvethe airtightness of the air supplementing cavity 1 c; and the sealingrings 1 a are arranged between the air ejection cavity body 17 and theair guide cavity body 18 to improve the airtightness of the air ejectioncavity 1 f.

As can be seen from the above description of the sampling device 1, thesampling device 1 of the embodiment sweeps the sample from the detectedobject 6 via the airflow ejected by the ejection part, promotes theswept sample to flow into the air guide cavity 1 j through the samplesuction port via the cyclone generated by the cyclone generation part,and then guides the airflow carrying the sample to enter thesemipermeable membrane device 3 for extraction by means of the air guidecavity 1 j.

The semipermeable membrane device 3 enriches and desorbs the samplecollected by the sampling device 1 via the semipermeable membrane 34,and then conveys the sample to the detection equipment 4. As shown inFIG. 1, in the embodiment, the semipermeable membrane device 3 comprisesthe semipermeable membrane 34, a holding member 33, a temperaturecontrol device 35, an air pump 36, a gas supply device 31 and afiltering device 32.

The semipermeable membrane 34, which is selective for the permeation ofdifferent particles, allows only the desired particles to permeate. Inthe embodiment, the semipermeable membrane 34 is capable of preventingthe permeation of impurities such as water molecules and ammoniamolecules, and restricting the formation of cluster molecules, therebybeing conducive to improving the detection sensitivity of the detectionequipment 4.

The holding member 33 is configured to hold the semipermeable membrane34. As shown in FIG. 1, in the embodiment, the first space 3 a locatedat one side of the semipermeable membrane 34 and the second space 3 blocated at the other side of the semipermeable membrane 34 are formedbetween the holding member 33 and the semipermeable membrane 34. The airguide cavity 1 j guides the airflow carrying the sample to flow into thefirst space 3 a, and after being extracted by the semipermeable membrane34, the sample carried by the airflow flowing into the first space 3 aenters the second space 3 b which is in fluid communication with thedetection equipment 4. Specifically, the air guide cavity 1 jcommunicates with the first space 3 a through the sample introducingtube 2. Thus, the sample collected by the sampling device 1 can enterthe first space 3 a via the sample introducing tube 2, permeate throughthe second space 3 b after being enriched and desorbed by thesemipermeable membrane 34, and finally flow into the detection equipment4 to complete the detection.

The temperature control device 35 is configured to heat and cool thesemipermeable membrane 34. The semipermeable membrane 34 enriches thesamples at a lower temperature and desorbs the samples at a highertemperature. By setting the temperature control device 35, thesemipermeable membrane 34 can be controlled to cooperate with thesampling device 1 to realize a sample enrichment and desorption process.Before the sampling device 1 finish collecting samples, thesemipermeable membrane 34 can be cooled by the temperature controldevice 35, so that sample molecules 5 capable of penetrating through thesemipermeable membrane 34 are adsorbed on the semipermeable membrane 34to achieve sample enrichment; and after the sampling device 1 completesthe sampling, the semipermeable membrane 34 can be heated by thetemperature control device 35 to release the sample molecules 5 adsorbedon the semipermeable membrane 34, and then the sample molecules flow tothe detection equipment 4 through the second space 3 b. As shown in FIG.1, in order to facilitate the arrangement of the temperature controldevice 35, the temperature control device 35 of the embodiment isarranged on the outer surface of the holding member 33, and indirectlyheats and cools the semipermeable membrane 34 by heating and cooling theholding member 33. Based on this, the holding member 33 can be made ofan inert metal material with good thermal conductivity to facilitate theheat transfer. The temperature control device 35 may comprise a heatingdevice and a cooling device. The heating device may comprise a heatingwire, a heating belt, a heating sheet or the like. The cooling devicemay comprise a semiconductor refrigeration device or the like.

The air pump 36 is in fluid communication with the first space 3 a fordischarging the airflow that does not penetrates through thesemipermeable membrane 34 to the outside of the first space 3 a, so asto achieve the cleaning purpose. By setting the air pump 36, thedischarge speed of the substance that does not penetrates through thesemipermeable membrane 34 can be accelerated, and the cleaningefficiency is improved. Specifically, as can be seen from FIG. 1, theair pump 36 and the detection equipment 4 are respectively connected tothe lower portions of the first space 3 a and the second space 3 b.During operation, the detection equipment 4 is in a negative pressurestate and has a certain suction force which is set to be greater thanthat of the air pump 36.

The air supply device 31 is in fluid communication with the second space3 b to inject the carrier gas into the second space 3 b, and the carriergas is mixed with the sample entering into the second space 3 b afterbeing desorbed by the semipermeable membrane 34 and then flows to thedetection equipment 4. By setting the gas supply device 31, the samplemolecules 5 penetrating through the semipermeable membrane 34 can befurther driven to flow to the detection equipment 4 by the carrier gas,so that the speed of the desorbed sample molecules 5 to flow to thedetection equipment 4 is accelerated, and then the detection efficiencyis improved.

The filtering device 32 is arranged on a communication path between thegas supply device 31 and the second space 3 b to filter the carrier gasflowing from the gas supply device 31 to the second space 3 b. Thefiltering device 32 is configured to filter the carrier gas provided bythe gas supply device 31 to remove impurities such as moisture in thecarrier gas, thereby the purity of the sample sent to the detectionequipment 4 being further improved, which is conducive to improving thedetection accuracy and the detection sensitivity.

The working process of the sample collecting and introducing device inthe embodiment may be carried out as follows:

When sampling, the air pump 10 below the air ejection cavity 1 f work ina pulse manner, so that the airflow ejected from the ejection hole 1 himpacts the detected object 6 in the pulse manner to sweep the sampledown. In the process, the air supplementing pump 14 communicating withthe air supplementing cavity 1 c through the air supplementing tube 13keeps on, the swirling hole 1 b keeps blowing air, so that under thesuction of the negative pressure center of the cyclone generated by thecyclone generation part and the air pump 36 located at the bottom of thefirst space 3 a, the swept sample molecules enter the first space 3 a ofthe semipermeable membrane device 3 through the air guide cavity 1 j, atthis time, the semipermeable membrane 34 is in a low temperature stateunder the refrigeration of the temperature control device 35, themajority of the sample molecules are adsorbed on the semipermeablemembrane 34 after entering the first space 3 a to realize sampleenrichment, and water molecules and the like which cannot be adsorbed bythe semipermeable membrane 34 are discharged to the outside of the firstspace 3 a by the air pump 36 at the lower end of the semipermeablemembrane device 3 to achieve the purpose of preliminary cleaning; afterthe collection is performed for a certain period of time, thesemipermeable membrane 34 is rapidly heated by the temperature controldevice 35, so that the sample adsorbed on the semipermeable membrane 34is desorbed from the semipermeable membrane 34, the desorbed samplemolecules 5 enter the detection equipment 4 for detection under theaction of the negative pressure of the detection equipment 4 and thedriving of the carrier gas provided by the gas supply device 31,meanwhile the temperature control device 35 rapidly cools the holdingmember 33 to perform a next sampling process.

In addition, as can be seen from FIG. 1, the semipermeable membranedevice 3 of the embodiment is integrally arranged outside the shell ofthe sampling device 1, that is, not only the semipermeable membrane 34is located outside the shell of the sampling device 1, but also otherparts of the semipermeable membrane device 3, such as the holding member33, the air pump 36, the heat preservation device 35, the gas supplydevice 31 and the filtering device 32, are located outside the shell ofthe sampling device 1.

In the embodiment, the advantages of the semipermeable membrane device 3being integrally arranged outside the sampling device 1 lie that, on onehand, the semipermeable membrane device 3 and the sampling device 1 arerelatively independent with each other, so that it's easier toseparately disassemble, maintain and improve the semipermeable membranedevice 3 and the sampling device 1, and particularly, it is convenientto replace the semipermeable membrane 34 that needs to be replacedfrequently; on the other hand, the semipermeable membrane 34 is locatedat the outside of the sampling device 1, the size of the semipermeablemembrane 34 is no longer limited by the sampling device 1, and when thearea of the semipermeable membrane 34 is increased, the sizes of the airguide cavity body 18, the air ejection cavity body 17, the heatingdevice 16, the heat preservation device 15, and the shell do not need tobe increased accordingly, therefore the area of the semipermeablemembrane 34 can be conveniently increased on the premise of notexcessively increasing the volume and the weight of the samplecollecting and introducing device, and as the contact area between thesample and the semipermeable membrane 34 can be increased by increasingthe area of the semipermeable membrane 34, the sample collectionefficiency can be more conveniently improved.

Moreover, in order to further improve the sample extraction rate of thesemipermeable membrane device 3, as shown in FIG. 1 and FIG. 4, in theembodiment, a concave part 331 is further arranged on one side surfaceof the holding member 33 adjacent to the semipermeable membrane 34. Asthe concave part 331 is arranged on the inner surface of the holdingmember 33, the area of the inner surface of the holding member 33 isincreased, thereby the time of the sample penetrating from one side ofthe semipermeable membrane 34 (the first space 3 a) to the other side ofthe semipermeable membrane 34 (the second space 3 b) being prolonged,the sample enrichment factor being increased, and the sample enrichmentrate being improved. Except for the concave part 331, a convex part maybe arranged on the side surface of the holding member 33 close to thesemipermeable membrane 34 instead, or the concave part 331 and theconvex part may both be arranged on the side surface of the holdingmember 33 close to the semipermeable membrane 34 at the same time.Actually, as long as the contact area of the airflow and thesemipermeable membrane can be increased and the semipermeable membrane34 can be supported with sufficient strength at the same time, thevariations all fall within the protection scope of the presentdisclosure.

In summary, as described above, based on the sample collecting andintroducing device of the present disclosure, the area of thesemipermeable membrane 34 can be easily increased, and a sampling andconcentration process with a wider boiling point range and higherefficiency can be realized. The sample collecting and introducing deviceof the present disclosure may be cooperatively used with an ion mobilityspectrometer (IMS), a gas chromatograph (GC), a mass spectrometer (MS),a gas chromatograph and ion mobility spectrometer (GC-IMS), a gaschromatograph and mass spectrometer (GC-MS) and other detectionequipment 4 to realize onsite real-time detection and analysis ofvolatile, semi-volatile, surface contaminants and the like, which is ofhigh detection speed detection accuracy. Accordingly, the presentdisclosure further provides a detection system, including detectionequipment 4 and the sample collecting and introducing device of thepresent disclosure.

The above descriptions are only exemplary embodiments of the presentdisclosure, and are not intended to limit the present disclosure. Anymodifications, equivalent replacements, improvements and the like madewithin the spirit and principle of the present disclosure should beencompassed within the protection scope of the present disclosure.

What is claimed is:
 1. A sample collecting and introducing device,comprising: a sampling device, for collecting a sample; and asemipermeable membrane device, for extracting the sample collected bythe sampling device and introducing the extracted sample to detectionequipment; wherein the sampling device is provided with an air guidecavity which is configured to guide airflow carrying the sample to flowto the semipermeable membrane device, the semipermeable membrane deviceis provided with a semipermeable membrane, and the semipermeablemembrane is arranged at the outside of the sampling device.
 2. Thesample collecting and introducing device according to claim 1, whereinthe semipermeable membrane device further comprises a holding member forholding the semipermeable membrane, and a first space located at oneside of the semipermeable membrane and a second space located at theother side of the semipermeable membrane exist between the holdingmember and the semipermeable membrane, wherein the air guide cavityguides the airflow carrying the sample to flow into the first space, thesample carried by the airflow flowing into the first space enters thesecond space after being desorbed by the semipermeable membrane, and thesecond space is in fluid communication with the detection equipment. 3.The sample collecting and introducing device according to claim 2,wherein at least one of a concave part and a convex part is provided ona side surface of the holding member adjacent to the semipermeablemembrane.
 4. The sample collecting and introducing device according toclaim 2, wherein the semipermeable membrane device further comprises anair pump, the air pump is in fluid communication with the first space todischarge the airflow that does not penetrates through the semipermeablemembrane to the outside of the first space.
 5. The sample collecting andintroducing device according to claim 2, wherein the semipermeablemembrane device further comprises a gas supply device, the gas supplydevice is in fluid communication with the second space to inject acarrier gas into the second space, and the carrier gas flows to thedetection equipment after being mixed with the sample that is desorbedby the semipermeable membrane and enters the second space.
 6. The samplecollecting and introducing device according to claim 5, wherein thesemipermeable membrane device further comprises a filtering device, thefiltering device is arranged on a communication passage between the gassupply device and the second space to filter the carrier gas flowingfrom the gas supply device to the second space.
 7. The sample collectingand introducing device according to claim 1, wherein the semipermeablemembrane device further comprises a temperature control device, thetemperature control device is configured to heat and cool thesemipermeable membrane, so that the semipermeable membrane deviceenriches the sample at a relatively low temperature and desorbs thesample at a relatively high temperature.
 8. The sample collecting andintroducing device according to claim 1, further comprising a sampleintroducing tube, and the sample introducing tube is connected betweenthe air guide cavity and the semipermeable membrane device.
 9. Thesample collecting and introducing device according to claim 1, whereinthe semipermeable membrane device is arranged at the outside of thesampling device.
 10. The sample collecting and introducing deviceaccording to claim 1, wherein the sampling device comprises an ejectionpart, the ejection part is configured to sweep the sample attached tothe detected object through the airflow, and the swept sample flows tothe air guide cavity under the drive of the airflow.
 11. The samplecollecting and introducing device according to claim 10, wherein theejection part comprises an air pump, an air ejection cavity and anejection hole, which are in fluid communication with each othersuccessively, and the air pumped by the air pump is ejected toward thedetected object through the air ejection cavity and the ejection hole.12. The sample collecting and introducing device according to claim 10,wherein the sampling device further comprises a cyclone generation part,and the cyclone generation part is configured to generate cyclone anddrive the sample swept by the ejection part to flow to the air guidecavity via the generated cyclone.
 13. The sample collecting andintroducing device according to claim 12, wherein the cyclone generationpart comprises an air supplementing pump, an air supplementing cavityand a swirling hole, which are in fluid communication with each othersuccessively, the air supplementing pump pumps airflow into the airsupplementing cavity, and the swirling hole rotationally ejects theairflow entering the air supplementing cavity to form the cyclone. 14.The sample collecting and introducing device according to claim 13,wherein the swirling hole extends from the air supplementing cavity tothe outer surface of the sampling device.
 15. A detection system,comprising detection equipment and the sample collecting and introducingdevice according to claim 1, wherein the semipermeable membrane deviceof the sample collecting and introducing device is in fluidcommunication with the detection equipment.